Air 802 AP-G250 User manual

Wireless LAN Device Series
AP-G250
Multi-Function WLAN AP
User Manual
Version 1.0 (October 2008)

AP-G250 User Manual i
TABLE OF CONTENTS
SAFETY AND REGULATORY NOTICES..................................................................................................... 1
FCC STATEMENT ........................................................................................................................................ 1
FCC CAUTION ............................................................................................................................................ 1
FCC RF RADIATION EXPOSURE STATEMENT ................................................................................................ 1
CANADIAN DEPARTMENT OF COMMUNICATIONS INDUSTRY CANADA (IC) NOTICE............................................. 2
SAFETY GUIDELINES ................................................................................................................................. 2
PACKING LIST ............................................................................................................................................. 3
PRODUCT OVERVIEW ................................................................................................................................ 4
FRONT VIEW ............................................................................................................................................... 4
REAR VIEW ................................................................................................................................................. 4
HARDWARE INSTALLATION ...................................................................................................................... 5
CONFIGURATION PREPARATION ............................................................................................................. 5
HOW TO ACCESS CONFIGURATION AREA ...................................................................................................... 5
BASIC LOGICAL PARTITIONING...................................................................................................................... 5
DEFAULT IP ADDRESS ................................................................................................................................. 5
HOW TO SEE YOUR COMPUTER’S IP ADDRESS ............................................................................................. 6
HOW TO TEMPORARILY ASSIGN AN IP ADDRESS TO YOUR COMPUTER............................................................ 6
ACCESSIBILITY TO CONFIGURATION VS.OPERATING MODE .......................................................................... 11
DHCP...................................................................................................................................................... 11
WIRELESS CONFIGURATION .................................................................................................................. 12
OPERATION AND WIRELESS MODES ........................................................................................................... 12
Operational Modes .............................................................................................................................................12
Wireless Modes ..................................................................................................................................................12
OPERATIONAL MODES OVERVIEW .............................................................................................................. 12
Router.................................................................................................................................................................12
Bridge .................................................................................................................................................................12
WISP (Wireless ISP)...........................................................................................................................................13
WIRELESS MODES OVERVIEW ................................................................................................................... 13
AP (Access Point)...............................................................................................................................................13
Client ..................................................................................................................................................................13
WDS (Wireless Distribution System) ..................................................................................................................13
WDS+AP ............................................................................................................................................................14
WIRELESS BASIC SETTINGS....................................................................................................................... 14
Disable Wireless LAN Interface ..........................................................................................................................14
Band ...................................................................................................................................................................14
Mode ..................................................................................................................................................................15
Network Type......................................................................................................................................................15
SSID ...................................................................................................................................................................16
Channel Number ................................................................................................................................................16
Show Active Clients ............................................................................................................................................17
Mac Clone (Single Ethernet Client) ....................................................................................................................17
Universal Repeater.............................................................................................................................................18
WIRELESS ADVANCED SETTINGS................................................................................................................ 19
Authentication Type ............................................................................................................................................20
Fragment Threshold ...........................................................................................................................................20
RTS Threshold....................................................................................................................................................20
Beacon Interval...................................................................................................................................................20
ACK Timing ........................................................................................................................................................21
Client Expired Time ............................................................................................................................................21

AP-G250 User Manual ii
MTU Size............................................................................................................................................................21
Data Rate ...........................................................................................................................................................21
Preamble Type....................................................................................................................................................21
Broadcast SSID ..................................................................................................................................................21
IAPP (Inter-Access Point Protocol).....................................................................................................................22
802.11g Protection..............................................................................................................................................22
Block WLAN Relay (Isolate Client) .....................................................................................................................22
Turbo Mode ........................................................................................................................................................22
Transmit Power...................................................................................................................................................22
CONFIGURING WIRELESS SECURITY........................................................................................................... 23
WEP Encryption Setting .....................................................................................................................................23
WEP Encryption with 802.1x Setting ..................................................................................................................25
WPA Authentication Mode ..................................................................................................................................26
WIRELESS ACCESS CONTROL .................................................................................................................... 27
WDS........................................................................................................................................................ 27
WDS Network Topology......................................................................................................................................28
WDS Application.................................................................................................................................................32
Site Survey .........................................................................................................................................................33
Connecting Profile ..............................................................................................................................................34
TCP/IP CONFIGURATION ......................................................................................................................... 36
LAN INTERFACE........................................................................................................................................ 36
Default Gateway .................................................................................................................................................36
DHCP Server......................................................................................................................................................36
DHCP Client Range............................................................................................................................................37
WAN INTERFACE ...................................................................................................................................... 38
Static IP ..............................................................................................................................................................39
DHCP Client (Dynamic IP)..................................................................................................................................40
PPPoE................................................................................................................................................................41
PPTP ..................................................................................................................................................................42
Configuring Clone MAC Address........................................................................................................................43
VPN Pass-through..............................................................................................................................................45
ROUTE ................................................................................................................................................... 46
NAT (Network Address Translation)....................................................................................................................46
IP Forwarding Default Policy ..............................................................................................................................47
Static Route Setup..............................................................................................................................................47
Dynamic Route Setup.........................................................................................................................................48
FIREWALL CONFIGURATION................................................................................................................... 50
CONFIGURING LAN TO WAN FIREWALL...................................................................................................... 50
PORT FILTERING ....................................................................................................................................... 50
IP FILTERING............................................................................................................................................. 51
MAC FILTERING ........................................................................................................................................ 52
CONFIGURING PORT FORWARDING (VIRTUAL SERVER)................................................................................ 53
Multiple Servers behind NAT (Example).............................................................................................................54
CONFIGURING DMZ .................................................................................................................................. 55
CONFIGURING VPN................................................................................................................................... 56
MANAGEMENT .......................................................................................................................................... 57
STATUS..................................................................................................................................................... 57
QUALITY OF SERVICE (QOS)...................................................................................................................... 58
BANDWIDTH CONTROL............................................................................................................................... 61
SNMP AGENT........................................................................................................................................... 62
STATISTICS ............................................................................................................................................... 65
TIME ZONE SETTING.................................................................................................................................. 65
LOG.......................................................................................................................................................... 66
MISCELLANEOUS SETTINGS ....................................................................................................................... 66
HTTP Port...........................................................................................................................................................66
PING WATCHDOG...................................................................................................................................... 67

AP-G250 User Manual iii
MESH NETWORK ....................................................................................................................................... 68
UPGRADE FIRMWARE ................................................................................................................................74
Firmware Overview.............................................................................................................................................74
Firmware Upgrade Procedure ............................................................................................................................74
Save/Reload Settings .........................................................................................................................................75
Password............................................................................................................................................................76
USING CLI MENU ...................................................................................................................................... 77
START A SSH (SECURE SHELL)CLIENT SESSION......................................................................................... 77
EXECUTE CLI PROGRAM............................................................................................................................ 77
AUTO-DISCOVERY TOOL......................................................................................................................... 79
TROUBLESHOOTING................................................................................................................................ 81
Basics.................................................................................................................................................................81
Power Light Not On ............................................................................................................................................81
Ethernet Light (LED) Not On...............................................................................................................................81
Web Browser Configuration Screen Not Available..............................................................................................81
Configuration Changes Not Saved .....................................................................................................................82
No Internet Access .............................................................................................................................................82
Troubleshooting a TCP/IP Network Using a Ping Utility......................................................................................85
Testing the Path from Your Computer to a Remote Device ................................................................................86
APPENDIX A .............................................................................................................................................. 87
TECHNICAL SPECIFICATIONS ...................................................................................................................... 87
APPENDIX B .............................................................................................................................................. 91
BASIC WIRELESS BRIDGED ACCESS POINT................................................................................................. 91
BASIC WIRELESS ROUTER......................................................................................................................... 91
UNIVERSAL REPEATER MODE .................................................................................................................... 91
WDS OR WDS+AP MODE ........................................................................................................................ 92
CLIENT MODE ........................................................................................................................................... 92

AP-G250 User Manual 1
SAFETY AND REGULATORY NOTICES
FCC Statement
The AP-G250 Access Point has been tested and found to comply with the specifications
for a Class B digital device, pursuant to Part 15 of the FCC Rules. Operation is subject
to the following two conditions:
yThis device may not cause harmful interference
yThis device must accept any interference received, including interference that
may cause undesired operation.
These limits are designed to provide reasonable protection against harmful interference
in a residential installation. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used according to the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which is found by turning the
equipment off and on, the user is encouraged to try and correct the interference by one
or more of the following measures:
yReorient or relocate the receiving antenna
yIncrease the separation between the equipment or devices
yConnect the equipment to an outlet other than the receiver’s
yConsult a dealer or an experienced radio/TV technician for assistance
FCC Caution
Any change of modification to the product not expressly approved by AIR802 could void
the user’s authority to operate the device.
FCC RF Radiation Exposure Statement
To comply with the FCC rules 47 CFR 1.1307 and ANSI C95.1 RF exposure limits, the
antenna(s) for this device must comply with the following:
A minimum separation distance of at least 20cm (8 inches) is required between the
antenna and all persons.

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Canadian Department of Communications Industry
Canada (IC) Notice
This Class B digital apparatus complies with Canadian ICES-003 and RSS-210.
Cet appareil numérique de la classe B est conforme à la norme NMB-003 et CNR-210
du Canada.
Safety Guidelines
yDo not touch or move antenna(s) while the unit is transmitting or receiving.
yDo not hold any component containing a radio such that the antenna is very
close to or touching any exposed parts of the body, especially the face and eyes,
while transmitting.
yDo not operate the radio or attempt to transmit data unless the antenna is
connected; otherwise the radio may be damaged.
yAntenna selection and installation should follow the rules of the country in which
the device is being installed. Professional installation is recommended.

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PACKING LIST
Before you start to install the AP-G250, make sure the package contains the following
items
yAP-G250 unit
yAntenna
yPower Supply
yEthernet Network Cable
yCD

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PRODUCT OVERVIEW
Front View
Rear View
1. Power supply connector
2. WAN/LAN Connector – This port can be used as a WAN interface that connects
to a DSL or Cable Modem, or as a LAN port for connection to a computer, printer
or other networked device.
3. LAN Port – This port connects a computer, printer or other networked device.
4. Reset Button
no
pq

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HARDWARE INSTALLATION
Once you have ensured that you have all required components, you can install the
AP-G250.
1. Connect the Ethernet network cable between the WAN/LAN Interface Connector at
the rear of the AP and your network. The network connection may be a cable or DSL
modem, existing router or other device. For some applications, a cable is not
required.
2. Connect the power supply to the Power Supply Connector to the rear of the AP and
to the power outlet.
3. Connect another Ethernet network cable (not supplied with the AP) between the
LAN Interface Connector and a computer or other network device, as required.
4. Initial configuration can be performed using the wired LAN port or via wireless
connection.
You can now proceed to use the computer to configure the AP-G250.
CONFIGURATION PREPARATION
How to Access Configuration Area
There are two ways to configure the device:
1. Using a web-browser, such as Internet Explorer.
2. Using a Secure Shell CLI Interface.
Basic Logical Partitioning
For many first time users, it might be useful to consider the AP-G250 as having two
logical sections: a wired Ethernet network interface (NIC) and an 802.11b/g wireless
network interface (NIC). Each interface has its own MAC address.
Default IP Address
The AP-G250 has a default LAN IP address of 192.168.2.254 and a subnet-mask
address of 255.255.255.0. To access the AP-G250 configuration, you must first ensure
that your computer’s IP address is on the same subnet (192.168.2.X) as the default IP

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address. For example, you can assign your computer an IP address of 192.168.2.200.
Do not assign 192.168.2.254 (this is the IP address of the AP-G250).
Your computer probably is set to “Obtain IP Address Automatically”. If the last IP
address was on another network, such as 192.168.1.200, then you will not be able to
connect without temporarily assigning your computer an IP address in the same subnet.
Typically, the AP-G250 is accessed via the LAN or wireless interface, however if you
need to access the AP-G250 via the WAN interface, the default IP address is 172.1.1.1
and you will need to ensure that you are on the same subnet (172.1.1.X).
How to See Your Computer’s IP Address
For a Windows-based computer, follow these steps:
1. Click Start > Run.
2. Type CMD in the Open: field and click OK.
3. Type ipconfig at the cursor prompt and press Enter.
4. Scroll to Ethernet Adapter Local Area Connection and note the listing for IP
address.
How to Temporarily Assign an IP Address to Your
Computer
The following example illustrates the procedure for statically assigning an IP address in
the same subnet as the default address.
Windows XP
1. Click Start, right click My Network Places and click Properties.

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2. Right click either Local Area Connection or Wireless Network Connection,
depending on how you are accessing the AP-G250 (by an Ethernet network
cable or via a wireless card), and select Properties.
3. Select Internet Protocol (TCP/IP) and click Properties.

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4. Click the button to select Use the following IP address. Enter a Static IP
Address in the same subnet as the Default IP Address.
5. Click OK.
Windows VISTA
1. Click Start, right click Network and choose Properties. The Network and
Sharing Center opens.

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2. Select Manage Network Connections from the left sidebar.
3. Right click either Local Area Connection or Wireless Network Connection,
depending on how you are accessing the AP-G250 (by an Ethernet network
cable or via a wireless card), and select Properties.

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4. Click Internet Protocol Version 4 (TCP/IPv4) and click Properties.
6. Click the button to select Use the following IP address. Enter a Static IP
Address in the same subnet as the Default IP Address.
7. Click OK, and OK again in the previous Connection Properties window.

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Accessibility to Configuration vs. Operating Mode
The AP-G250 has three operation modes: Router, Bridge and WISP (see Wireless
Configuration for a detailed explanation). Accessibility to the AP-G250’s LAN interface
depends on the current mode of operation, as shown in the following table:
CONFIGURATION ACCESSIBILITY CHART
Operating Mode WLAN WIRED LAN WAN
Router YES NO YES
Bridge(AP Client) YES YES NO
WISP YES YES YES
For example, if the AP-G250 is operating in Router mode and you try to access the AP-
G250 IP address from the wired Ethernet LAN connection, you will not succeed since
NAT will be enabled.
DHCP
By default, the DHCP server is operational. If you are connecting the AP-G250 in Bridge
mode into a wired router with DHCP running, you need to change the DHCP server
setting. Multiple DHCP servers running in the network will result in conflicts. In this
event, change DHCP to either disabled or client.
Note: If you change DHCP to client, it will obtain its IP address from the upstream
DHCP server (this could be a consumer grade broadband router to which the AP-G250
is connected). If you change DHCP to disabled, it will use the IP address assigned by
you or the default IP address.
Auto-Discovery Tool
The CD included in the AP-G250 package contains the manual and an auto-discovery
tool. This tool is very useful if you’ve forgotten the IP address of the AP-G250 or are
configuring a previously installed access point with an unknown device address. It will
discover the IP address even if your computer is not in the same subnet as the AP-
G250. See Auto-Discovery Tool for more information.

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WIRELESS CONFIGURATION
The AP-G250 configuration software includes a Wizard that assists you in making most
basic changes. Alternatively, instead of using the Wizard or if you need changes to
functions that the Wizard does not allow you to change, click on the various file folders.
Operation and Wireless Modes
Operational Modes
The AP-G250 has three possible operational modes to choose from:
yRouter
yBridge
yWISP (Wireless ISP)
Note: The operational mode relates to the communication between the wired Ethernet
network interface card (NIC) and the wireless NIC.
Wireless Modes
The wireless radio interface has four possible modes to choose from:
yAP (Access Point)
yClient
yWDS (Wireless Distribution System)
yWDS + Access Point
Operational Modes Overview
Router
The wired Ethernet (WAN) port is used to connect with an ADSL/Cable modem or router
and the wireless network interface (NIC) is used for your private wireless local area
network (WLAN). Network address Translation (NAT) exists between the wired Ethernet
network interface and the wireless network interface. All wireless clients share the same
public IP address (provided through the cable or DSL modem) through the WAN port to
the ISP. The default IP configuration for the WAN port is static IP. You can access the
web server of the device through the default WAN IP address 172.1.1.1 and modify the
setting to DHCP client or other options based on your ISP requirement.
Bridge
When this mode is selected, the wired Ethernet and wireless NIC are bridged together
and all the WAN related functions are disabled. This mode is the most common and is

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the default operational mode. It is often used when the AP-G250 is being wired to an
existing router or switch. When using Bridge mode, the LAN IP address can be
accessed via the wired or wireless interface.
WISP (Wireless ISP)
This mode lets you access the access point of your wireless ISP or connect to any
available wireless network and share the same public IP address from your ISP or
wireless service with the PCs connecting with the wired Ethernet port of the AP-G250.
In this mode, the Ethernet port will often be connected to another wireless router.
To use this mode, you must first set the wireless radio to client mode and connect to the
AP (access point) of your ISP. Then you can configure the WAN IP configuration to meet
your ISP requirements.
Wireless Modes Overview
AP (Access Point)
In this mode, the wireless radio of the AP-G250 serves as communications “hub” for
wireless clients and provides a connection to a wired LAN.
Client
This mode provides the capability to connect with another access point using
infrastructure/Ad-hoc networking. With bridge operation mode, you can directly connect
the wired Ethernet port to your PC and the AP-G250 becomes a wireless client or
adapter. With WISP operation mode (NAT is enabled), you can connect the wired
Ethernet port to a hub/switch and all the PCs connecting with the hub/switch can share
the same public IP address from your ISP.
WDS (Wireless Distribution System)
This mode serves as a wireless repeater. The AP-G250 forwards the packets to another
AP with WDS function. When this mode is selected, it is not broadcasting an SSID and
wireless clients can’t survey and connect to the device.

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WDS+AP
This mode combines WDS and AP modes, allowing WDS connections and letting
wireless clients survey and connect to the device.
Table of Operational and Wireless Mode Combinations
Bridge Router WISP
AP YES YES NO
WDS YES YES NO
Client YES NO YES
AP+WDS YES YES NO
Wireless Basic Settings
Disable Wireless LAN Interface
Checking this will disable the wireless LAN interface. This would not ordinarily be
disabled.
Band
The options are: 802.11b, 802.11g or 802.11b/g. Default is 802.11b/g.

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Mode
The modes selectable are: AP, Client, WDS, WDS+AP. See the full description and
details of each of these in the preceding section.
Network Type
1. Infrastructure
This network type requires the presence of an 802.11b/g Access Point. All
communication is done via the AP.
Ethernet
AP
AP Client #2
AP Client #1
2. Ad Hoc
This type provides a peer-to-peer communication between wireless stations. All the
communication is done from Client to Client without any Access Point involved. Ad Hoc
networking must use the same SSID and channel for establishing the wireless
connection.
PC #3 PC #2
AP Client #1
AP Client #2AP Client #3
PC #1
In client mode, the AP-G250 doesn’t support Router mode functions, including Firewall
and WAN settings.

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SSID
The SSID is a unique identifier that wireless networking devices use to establish and
maintain wireless connectivity. Multiple access point/bridges on a network or sub-
network can use the same SSID. SSIDs are case sensitive and can contain up to 32
alphanumeric characters.
Channel Number
The following table lists the available frequencies (in MHz) for the 2.4 GHz radio:
Channel No. Frequency Country Domain
1 2412 Americas, EMEA, Japan and China
2 2417 Americas, EMEA, Japan and China
3 2422 Americas, EMEA, Japan, Israel and China
4 2427 Americas, EMEA, Japan, Israel and China
5 2432 Americas, EMEA, Japan, Israel and China
6 2437 Americas, EMEA, Japan, Israel and China
7 2442 Americas, EMEA, Japan, Israel and China
8 2447 Americas, EMEA, Japan, Israel and China
9 2452 Americas, EMEA, Japan, Israel and China
10 2457 Americas, EMEA, Japan and China
11 2462 Americas, EMEA, Japan and China
12 2467 EMEA and Japan only
13 2472 EMEA and Japan only
14 2484 Japan only
Note: The system ships with channels 1 through 11 enabled. If you are located in a country that allows
channels 12, 13 and 14, you can contact AIR802 for information on enabling the additional channels.
When Channel Number is set to Auto, the AP-G250 will find the least-congested
channel for use.